Optical disk device and optical disk

Abstract

In an optical disk of HD-DVD, data is recorded in both grooves and lands. A groove track includes its own data region called a groove (G) track address system formed therein and a land track includes its own data region called a land (L) track address system formed therein. When tracing a groove track, address information X is read from the G track address system, and also address information Y is read from the L track address system. If neither relationship X=Y or X=Y+1 is satisfied, it is determined that the address information X includes an error. Further, a groove track includes its own data region called a groove (G) track address system having a parity bit formed therein and a land track includes its own data region called a land (L) track address system having a parity bit formed therein. When tracing a groove track, address information X is read from the G track address system, and also address information Y is read from the L track address system. Even when the parity is correct, if neither relationship X=Y or X=Y+1 is satisfied, it is determined that the address information X includes an error.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an optical disk device, and more particularly to a high-definition optical disk device which uses grooves and lands for data recording and reproducing.[0003]2. Description of Related Art[0004]HD (High-Definition) DVDs have been proposed in recent years as next generation DVDs. It is intended that the HD-DVDs adopt the disk structure of the current DVDs so as to ensure compatibility therewith, while simultaneously achieving higher density data recording than that of previous generation DVDs.[0005]As one main feature, HD-DVDs adopt the land / groove recording method in which information is recorded in both lands and grooves. Land tracks and groove tracks are formed in wobbles, in which address information is embedded. More specifically, address information is expressed using phase modulation in such a manner that a phase of 0 degree indicates “0” and a phase of 180 degrees indicates “1”. Her...

AI Technical Summary

Benefits of technology

The present invention provides an optical disk device that can effectively utilize information in both groove and land track address systems of an optical disk. This is achieved by demodulating and comparing address information from both systems when tracing the grooves or lands. The device can determine errors in the address information and correct them, improving the accuracy of the address information. Overall, the invention enhances the efficiency and accuracy of the optical disk device.

Problems solved by technology

On the other hand, even if it is determined that the parity is correct, there is a possibility that two error bits, or a greater even number of error bits, have been generated in the address information.

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